Carburetor



May. 13, 1923.

F. CQRTI CARBURETOR Filed July 8,

2 sheets-sheet 2 Patented Mar. 13, l23.

FELICE COR/TI, 0F MILAN, ITALY.

CARBURETOR.

Application filed July 8,

T 0 all whom z't may concern:

Be it known that FELICE Conrr, of Milan, Italy, has invented certain new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates to a carburetor for internal combustion engines of the type in which the air and fuel supplies are simultaneously regulated so as to maintain a constant-mixture-ratio.

1tv has previously been proposed in carburetors of the type referred to, to regulate the air inlet by means of two cylinders simultaneously rotating in opposite directions in the vicinity of the spray nozzle, the air passage areas depending on the shape of cavities formed in the said cylinders.

It is also known to use a carburetor in which the spray nozzle consists of two tubes. viz., one stationary and the other rotatable, capable of revolving one on the other in such a way that by the effect of the rotation, the spray holes are in partially or in fully opened or closed positions.

The invention also consists in' the improved carburetor as hereinafter more particularly referred to.

The carburetor forming the object of the invention shown diagrammatically in the annexed drawing, in which:

Figure 1 is a sectional elevation of the carburetor Figure 2 is a side view of the same, showing the air conduit partially in section.

Figures 3 and 4 are horizontal sections through Figure 1 showing two different positions both of the cylinders regulating the air inlet and of the rotating tube of .the spray nozzle.

Figure 5 ShOWs the spraying nozzle in larger scale 'partly in elevation and partly in section.

Figure 6 is a plan view of same.

Figure 7 is a detail of the spraying nozzle.

The working principle of the improved carburetor will be understood by reference to Figure 1. The benzine from a. constant level chamber flows through aaduct 5 in bottom into the spray nozzle, which is of special design and consists of two parts -11 and 14- arranged one inside the other in such a way that part -14 can be revolved upon part -11. The spray nozzle is shown in detail in Figures 5 and 6, from which it may be seen that it is built up of two tubes 11 14-- arranged one Serial No. 243,955.

inside the other and closed by spherical, upper surfaces 12- 15. The inner tube 11 is stationary and the outer tube can revolve on the inner one. The two tubes are held together by a, spring 16- hearing against flanged projections -18- formed at the bottom of the outertube -14, and against similar projections 17, formed on the inner tube. The said flanged projections are so designed as to permit of the two tubes being readily fitted into one another. Two longitudinal slots formed in the outer tube permit of the inner tube being slid into it, said slots being sufficiently wide to permit angular movements on the tube -11-.

The ends of spring -16- are respectively fixed to one of the projections --17- and -18.

The fixed inner tube and the revolving outer one are provided with one or two spray holes 1316, through which the benzine flows under the action of the engine suction; the two holes being arranged at a certain distance from the center line of the nozzle. It will be readily understood that when the outer tube 14 is caused to turn on the inner tube 11-, the holes in the one tube may accurately register with those of the other tube, or the holes may be partially or entirely closed. In the'former case the benzine outlet area has its maximum value, from which it can be gradually reduced to zero.

The air outlet takes place through lateral apertures 37 in body 1; the air and benzine mixture is formed in the chamber -2-, in the vicinity of the spraying nozzle; and it is thence carried to the motor inlet by a pipe. The air passage round the end of the nozzle is adjusted by two cylinders -7--8,wvhich turn in opposite directions to one another on their parallel spindles 7 8--. According as the two cylinders revolve in one direction or in the other they afford a gradually increasing or decreasing area for the air passage. Thus in the cylinder position represented in Figures 1 and 3 the annular air passage 36 is almost encylinders the air passage round the upper end of the nozzle can be increased or decreased at will. The cylinder spindles -78 are supported in the walls by the body 1.

The gears regulating the air inlet and those regulating the benzine inlet are operated simultaneously in such a way that, when the air passage area is increased, the benzine passage area is also increased though in a" different proportion, and the ratio of air to benzine is maintained constant.

The above mentioned simultaneous control of the two gears is obtained in the following manner: The cylinders 7-8 are provided with two grooves -2l in which a thin, flexible wire rope 19 is wound (Fig. 2), the rope end being connected to a rod 22- sliding in tube 23 and duly actioned by the conductor from outside.

Cylinders 78- are further provided with toothed wheels 2526 meshing with one another.

' When a pull is exerted on rope 19 cylinder 8 is rotated and cylinder 7- is driven by the latter through the gears -Q625.

A. suitable spiral spring 10 tends to bring the cylinders back into closing position. This spring 10 is arranged in a box with one end secured to the box and the other end 27 secured to the cylinder spindle 8'.

In order that at the same time the outer tube of the nozzle may be rotated about its own axis. thus simultaneously regulating the benzine inlet adisc or cam 29 rotating along with cylinder 7- is provided.

The inner surface of the disc 30 is bevelled, and a connecting link 31 bears with one end 33 against this surface, the link being connected to the lug 82 projecting from outer nozzle tube -14". Said link crosses the body 1. without touching the cylinders -78 or the nozzle.

' When the air passage, through the described rotation of cylinders -T-8- is varied the cam 29- either pushes or releases the rod -31,thereby rotating tube l&- and adjusting the air passage through holes 1316.

The spring -l6 acts as a return spring. The outer tube -1l being thus rotated on the inner tube 11, a gradual opening or closure of the nozzle or nozzles will be obtained. The contact between the rod end 33 and the bevelled surface 30- of the disc 29 is ensured by spring -16.

The object is thus obtained of accurately proportioning the amount of benzine to the amount of air at all speeds of the engine, appreciable economy being thus realized.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is In'a carburetor. in combination. a casing, a spring governed and manually operable variable air control. a spraying nozzle as- .sociated with said air control and composed of tubular sections one of which is rotatable with respect to the other. a lug projecting from the rotatable section. a rod link slidablv mounted in the casing and having its medial portion connected with said lug. a beveled disk associated with the air control and operable therewith and acting against the end of the rod link so as to regulate the operation of the rotatable tubular section of the spraying nozzle consistent with the operation of the variable air control. and a return spring associated with the other end of the rod link.

In testimony whereof I attixed my signature. in presence of two witnesses.

V FELICE CORTI. Vitnesses G. G. 'QUARINER, IvAN LAVIETSKY. 

